What does a JMBG encode?

The first seven digits are the date of birth (DDMMGGG), the next two are the region code, the next three are a serial that also encodes gender (under 500 = male, 500 and over = female), and the last is a modulo-11 check digit.

Does a valid JMBG mean the person is registered?

No. The checksum only confirms the number is internally consistent — it does not validate against any population register.

No. All decoding happens locally in your browser and nothing is sent anywhere.

Serbia JMBG Decoder

Decode a Serbian JMBG — date of birth, region, gender and checksum.

Serbian JMBG decoder

The JMBG (Jedinstveni matični broj građana) is a 13-digit identifier used across the former Yugoslavia. It encodes the date of birth in the first seven digits, a region code, a serial number that also indicates gender, and a modulo-11 check digit.

Paste a number and this tool decodes the date of birth, region and gender and verifies the check digit — all in your browser, with nothing uploaded.